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Title: Analysis of Poloidal Asymmetric Density Behaviors in SOL Induced by 4.6-GHz Lower Hybrid Launcher Power in EAST

Abstract

On the experimental advanced superconducting tokamak (EAST), a series of striations, including a few strong emissivity striations and several low emissivity striations, were observed in front of the 4.6-GHz lower hybrid (LH) launcher with the visible video camera for the LH power discharge. These striations indicate that LH may create significant poloidal scrape-off layer (SOL) density profile asymmetries in front of the LH launcher. These poloidal asymmetric density behaviors are further confirmed with the edge density measured by two Langmuir probes installed at the top and bottom of the LH launcher. The measured density depends on LH power injection and magnetic field direction. A 2D diffusive convective model was used to study the mechanisms of the observed striations and poloidal asymmetric density. The simulation results qualitatively match with the measured density, indicating these poloidal asymmetric effects are ascribed to the LHW-induced E{sub LH} × B{sub t} drift.

Authors:
; ; ; ; ; ; ; ;  [1]
  1. Chinese Academy of Sciences, Institute of Plasma Physics (China)
Publication Date:
OSTI Identifier:
22763305
Resource Type:
Journal Article
Journal Name:
Plasma Physics Reports
Additional Journal Information:
Journal Volume: 44; Journal Issue: 2; Other Information: Copyright (c) 2018 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1063-780X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ASYMMETRY; HT-7U TOKAMAK; LANGMUIR PROBE; LOWER HYBRID HEATING; MAGNETIC FIELDS; PLASMA SCRAPE-OFF LAYER; SIMULATION; STRIATIONS

Citation Formats

Li, Y. C., Ding, B. J., E-mail: bjding@ipp.cas.cn, Li, M. H., Wang, M., Liu, L., Wang, X. J., Xu, H. D., Shan, J. F., and Liu, F. K. Analysis of Poloidal Asymmetric Density Behaviors in SOL Induced by 4.6-GHz Lower Hybrid Launcher Power in EAST. United States: N. p., 2018. Web. doi:10.1134/S1063780X18020095.
Li, Y. C., Ding, B. J., E-mail: bjding@ipp.cas.cn, Li, M. H., Wang, M., Liu, L., Wang, X. J., Xu, H. D., Shan, J. F., & Liu, F. K. Analysis of Poloidal Asymmetric Density Behaviors in SOL Induced by 4.6-GHz Lower Hybrid Launcher Power in EAST. United States. doi:10.1134/S1063780X18020095.
Li, Y. C., Ding, B. J., E-mail: bjding@ipp.cas.cn, Li, M. H., Wang, M., Liu, L., Wang, X. J., Xu, H. D., Shan, J. F., and Liu, F. K. Thu . "Analysis of Poloidal Asymmetric Density Behaviors in SOL Induced by 4.6-GHz Lower Hybrid Launcher Power in EAST". United States. doi:10.1134/S1063780X18020095.
@article{osti_22763305,
title = {Analysis of Poloidal Asymmetric Density Behaviors in SOL Induced by 4.6-GHz Lower Hybrid Launcher Power in EAST},
author = {Li, Y. C. and Ding, B. J., E-mail: bjding@ipp.cas.cn and Li, M. H. and Wang, M. and Liu, L. and Wang, X. J. and Xu, H. D. and Shan, J. F. and Liu, F. K.},
abstractNote = {On the experimental advanced superconducting tokamak (EAST), a series of striations, including a few strong emissivity striations and several low emissivity striations, were observed in front of the 4.6-GHz lower hybrid (LH) launcher with the visible video camera for the LH power discharge. These striations indicate that LH may create significant poloidal scrape-off layer (SOL) density profile asymmetries in front of the LH launcher. These poloidal asymmetric density behaviors are further confirmed with the edge density measured by two Langmuir probes installed at the top and bottom of the LH launcher. The measured density depends on LH power injection and magnetic field direction. A 2D diffusive convective model was used to study the mechanisms of the observed striations and poloidal asymmetric density. The simulation results qualitatively match with the measured density, indicating these poloidal asymmetric effects are ascribed to the LHW-induced E{sub LH} × B{sub t} drift.},
doi = {10.1134/S1063780X18020095},
journal = {Plasma Physics Reports},
issn = {1063-780X},
number = 2,
volume = 44,
place = {United States},
year = {2018},
month = {2}
}